Novius

Mulsant, 1846

Species Guides

Novius cardinalis(Vedalia beetle)
Novius circumclusa
Novius koebelei(Koebele's ladybird)
Novius virginalis(Native Anovia)

Novius is a of ladybird beetles (Coccinellidae) and the sole member of the tribe Noviini. The genus contains over 70 , most formerly placed in the genera Rodolia and Anovia, which are now considered junior synonyms. Species of Novius are of scale insects, particularly cotton cushion in the genus Icerya, and have been widely used in programs. The best-known species, Novius cardinalis (the vedalia ), was introduced from Australia to California in the 1880s and achieved historic success in controlling Icerya purchasi.

Novius cardinalis by no rights reserved, uploaded by Jesse Rorabaugh. Used under a CC0 license.

Novius cardinalis 384959152 by Gilles San Martin. Used under a CC BY-SA 4.0 license.

Pronunciation

How to pronounce Novius: //ˈno.vi.us//

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Identification

Novius are distinguished from other Coccinellidae by their elongated body form and association with insect prey. Species vary in size from approximately 2.5 mm (N. amabilis) to 5 mm (N. fumidus, N. sexnotatus). Coloration ranges from bright reddish-brown to dull reddish-brown with variable spot patterns; some species have distinct black spots on while others lack spots entirely. Specific identification requires examination of male genitalia and other taxonomic characters. The can be separated from superficially similar ladybirds by its placement in the tribe Noviini, though this requires taxonomic expertise.

Images

Habitat

Associated with environments where Icerya scale insects occur, including agricultural systems, ornamental plantings, and natural vegetation supporting plants of these . Specific preferences vary by and region.

Distribution

Native distribution centered in East Asia and Australia, with some naturally occurring in India. Novius cardinalis has been introduced to numerous countries worldwide for , including the United States, Europe, and Pacific islands. N. pumilus has been used in biocontrol in Spain, Peru, and islands of Micronesia. Records exist from Uttarakhand, Punjab, and West Bengal in India for N. pumilus.

Diet

of cotton cushion scale insects (Margarodidae), particularly in the Icerya. Documented prey species include I. purchasi, I. seychellarum, I. aegyptiaca, and I. jacobsoni. Both larvae and feed on these prey.

Host Associations

Icerya purchasi - preyprimary prey of N. cardinalis
Icerya seychellarum - preyprey of N. pumilus
Icerya aegyptiaca - preyprey of N. pumilus
Icerya jacobsoni - preyprey of N. penicillioides
Macaranga tanarius - indirect plant of I. jacobsoni supporting N. penicillioides
Magnolia denudata - indirect plant of I. jacobsoni
Ficus microcarpa - indirect plant of I. jacobsoni
Psidium guajava - indirect plant of I. jacobsoni

Life Cycle

Larvae of at least some penetrate into the oocysts and second- and third-instar nymphs of Icerya to feed under the . Female typically lay in exposed sites near prey, or directly underneath prey when available.

Behavior

Specialized feeding involving penetration of insect protective coverings. Some have shown field adaptations to novel but related prey species. Performance is influenced by plant quality of the scale insect prey, with cascading effects up the .

Ecological Role

Important agents for cotton cushion pests. The introduction of Novius cardinalis to California in the 1880s is considered a landmark success in . contribute to natural regulation of Icerya in native and introduced ranges.

Human Relevance

Widely used in programs against cotton cushion scale insects. Novius cardinalis was the first successful case of using an imported natural enemy. N. pumilus and other continue to be used in pest management programs globally. sequencing of N. pumilus has been conducted to understand genetic adaptations underlying prey specialization.

Similar Taxa

RodoliaFormerly considered a separate , now synonymized with Novius; were transferred to Novius
AnoviaFormerly considered a separate , now synonymized with Novius; were transferred to Novius
Other CoccinelliniNovius is distinguished by its placement in the tribe Noviini and specialized -feeding , whereas most other Coccinellini are of aphids and other soft-bodied insects

More Details

Genomic Resources

The first high-quality sequence for the was reported for Novius pumilus, with a genome size of 176.16 Mb and 15,772 genes. Gene expansions were detected in chemosensors (odorant receptors), digestive (papain family cysteine ), and -related genes (leucine-rich repeats, GILT).

Microbiome

N. pumilus harbors bacterial including Lactococcus, Serratia, and Pseudomonas, which may assist in digesting the wax shell covering scale insects through hydrocarbon, , and degradation. Lactococcus shows potential with higher abundance in and . Horizontal transfer of Arsenophonus from prey I. aegyptiaca to the has been observed.

Taxonomic History

The Novius was established by Mulsant in 1846. Rodolia was described by Mulsant in 1850 and Anovia by other authors, but both are now treated as junior synonyms of Novius after decades of taxonomic debate. This synonymy has resulted in over 70 currently placed in Novius.